Topic
- Factories188
- Dwellings174
- Airports173
- United States167
- Sports166
- Labor unions157
- Clothing & dress154
- Vietnam War, 1961-1975151
- Governors144
- Social conflict143
- University of Detroit142
- Automobile industry workers138
- Office buildings137
- Pickets132
- African Americans131
- Ambassador Bridge (Detroit, Michigan and Windsor, Ont.)131
- Unemployment128
- Building construction127
- Protest movements125
- Prohibition123